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    <title>Advanced Mapbox Vector Tiles</title>
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          <h4 id="title">Advanced Mapbox Vector Tiles</h4>
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          <p id="shortdesc">Example of a Mapbox vector tiles map with custom tile grid.</p>
          <div id="docs"><p>A vector tiles map which reuses the same source tiles for subsequent zoom levels to save bandwidth on mobile devices. <strong>Note</strong>: No map will be visible when the access token has expired.</p>
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          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.format.MVT.html" title="API documentation for ol.format.MVT">ol.format.MVT</a></li>,<li><a href="../apidoc/ol.layer.VectorTile.html" title="API documentation for ol.layer.VectorTile">ol.layer.VectorTile</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.VectorTile.html" title="API documentation for ol.source.VectorTile">ol.source.VectorTile</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.Icon.html" title="API documentation for ol.style.Icon">ol.style.Icon</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li>,<li><a href="../apidoc/ol.style.Text.html" title="API documentation for ol.style.Text">ol.style.Text</a></li>,<li><a href="../apidoc/ol.tilegrid.TileGrid.html" title="API documentation for ol.tilegrid.TileGrid">ol.tilegrid.TileGrid</a></li></ul></div>
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          <textarea class="hidden" name="title">Advanced Mapbox Vector Tiles</textarea>
          <textarea class="hidden" name="description">Example of a Mapbox vector tiles map with custom tile grid.</textarea>
          <textarea class="hidden" name="js">var key &#x3D; &#x27;Your Mapbox access token from http://mapbox.com/ here&#x27;;

// Calculation of resolutions that match zoom levels 1, 3, 5, 7, 9, 11, 13, 15.
var resolutions &#x3D; [];
for (var i &#x3D; 0; i &lt;&#x3D; 8; ++i) {
  resolutions.push(156543.03392804097 / Math.pow(2, i * 2));
}
// Calculation of tile urls for zoom levels 1, 3, 5, 7, 9, 11, 13, 15.
function tileUrlFunction(tileCoord) {
  return (&#x27;https://{a-d}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/&#x27; +
      &#x27;{z}/{x}/{y}.vector.pbf?access_token&#x3D;&#x27; + key)
      .replace(&#x27;{z}&#x27;, String(tileCoord[0] * 2 - 1))
      .replace(&#x27;{x}&#x27;, String(tileCoord[1]))
      .replace(&#x27;{y}&#x27;, String(-tileCoord[2] - 1))
      .replace(&#x27;{a-d}&#x27;, &#x27;abcd&#x27;.substr(
          ((tileCoord[1] &lt;&lt; tileCoord[0]) + tileCoord[2]) % 4, 1));
}

var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.VectorTile({
      source: new ol.source.VectorTile({
        attributions: &#x27;© &lt;a href&#x3D;&quot;https://www.mapbox.com/map-feedback/&quot;&gt;Mapbox&lt;/a&gt; &#x27; +
          &#x27;© &lt;a href&#x3D;&quot;https://www.openstreetmap.org/copyright&quot;&gt;&#x27; +
          &#x27;OpenStreetMap contributors&lt;/a&gt;&#x27;,
        format: new ol.format.MVT(),
        tileGrid: new ol.tilegrid.TileGrid({
          extent: ol.proj.get(&#x27;EPSG:3857&#x27;).getExtent(),
          resolutions: resolutions,
          tileSize: 512
        }),
        tileUrlFunction: tileUrlFunction
      }),
      style: createMapboxStreetsV6Style(ol.style.Style, ol.style.Fill, ol.style.Stroke, ol.style.Icon, ol.style.Text)
    })
  ],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    minZoom: 1,
    zoom: 2
  })
});
</textarea>
          <textarea class="hidden" name="css">.map {
  background: #f8f4f0;
}
</textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
</textarea>
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        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Advanced Mapbox Vector Tiles&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://openlayers.org/en/v4.6.5/examples/resources/mapbox-streets-v6-style.js&quot;&gt;&lt;/script&gt;
    &lt;style&gt;
      .map {
        background: #f8f4f0;
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;script&gt;
      var key &#x3D; &#x27;Your Mapbox access token from http://mapbox.com/ here&#x27;;

      // Calculation of resolutions that match zoom levels 1, 3, 5, 7, 9, 11, 13, 15.
      var resolutions &#x3D; [];
      for (var i &#x3D; 0; i &lt;&#x3D; 8; ++i) {
        resolutions.push(156543.03392804097 / Math.pow(2, i * 2));
      }
      // Calculation of tile urls for zoom levels 1, 3, 5, 7, 9, 11, 13, 15.
      function tileUrlFunction(tileCoord) {
        return (&#x27;https://{a-d}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/&#x27; +
            &#x27;{z}/{x}/{y}.vector.pbf?access_token&#x3D;&#x27; + key)
            .replace(&#x27;{z}&#x27;, String(tileCoord[0] * 2 - 1))
            .replace(&#x27;{x}&#x27;, String(tileCoord[1]))
            .replace(&#x27;{y}&#x27;, String(-tileCoord[2] - 1))
            .replace(&#x27;{a-d}&#x27;, &#x27;abcd&#x27;.substr(
                ((tileCoord[1] &lt;&lt; tileCoord[0]) + tileCoord[2]) % 4, 1));
      }

      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.VectorTile({
            source: new ol.source.VectorTile({
              attributions: &#x27;© &lt;a href&#x3D;&quot;https://www.mapbox.com/map-feedback/&quot;&gt;Mapbox&lt;/a&gt; &#x27; +
                &#x27;© &lt;a href&#x3D;&quot;https://www.openstreetmap.org/copyright&quot;&gt;&#x27; +
                &#x27;OpenStreetMap contributors&lt;/a&gt;&#x27;,
              format: new ol.format.MVT(),
              tileGrid: new ol.tilegrid.TileGrid({
                extent: ol.proj.get(&#x27;EPSG:3857&#x27;).getExtent(),
                resolutions: resolutions,
                tileSize: 512
              }),
              tileUrlFunction: tileUrlFunction
            }),
            style: createMapboxStreetsV6Style(ol.style.Style, ol.style.Fill, ol.style.Stroke, ol.style.Icon, ol.style.Text)
          })
        ],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [0, 0],
          minZoom: 1,
          zoom: 2
        })
      });
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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